Keyword research is a practice used by search engine optimization professionals to find and research actual search terms people enter into the search engines when conducting a search. wikipedia.org

Article marketing is a type of advertising in which businesses write short articles about themselves as a marketing strategy. A primary style for the articles includes a bio box and byline (collectively known as the resource box) about the business. wikipedia.org

Social bookmarking is a method for Internet users to organize, store, manage and search for bookmarks of resources online. Many online bookmark management services have launched since 1996; Delicious, founded in 2003, popularized the terms "social bookmarking" and "tagging". wikipedia.org

Most good quality blogs are interactive, allowing visitors to leave comments and even message each other via GUI widgets on the blogs and it is this interactivity that distinguishes them from other static websites. In that sense, blogging can be seen as a form of social networking. wikipedia.org

Directory submission is an internet marketing process of submitting a websites to web directories in an effort to increase its page ranking. To maximize its benefits, internet marketers claim that it has to be done to hundreds of web directories.

A Web crawler is a computer program that browses the World Wide Web in a methodical, automated manner or in an orderly fashion. Other terms for Web crawlers are ants, automatic indexers, bots, Web spiders, Web robots, or especially in the FOAF community Web scutters. wikipedia.org

Web analytics is the measurement, collection, analysis and reporting of web data for purposes of understanding and optimizing web usage.